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Related Concept Videos

General Characteristics of Pipe Flow I01:22

General Characteristics of Pipe Flow I

Pipe flow refers to the movement of fluids within fully enclosed conduits, typically cylindrical in shape, such as water pipes or hydraulic hoses. These conduits are designed to withstand high-pressure gradients that drive fluid movement, contrasting with open-channel flows, where gravity is the primary driving force. Rectangular conduits, like air conditioning and heating ducts, generally operate at lower pressures and are less suited for high-pressure applications.
The classification of fluid...
General Characteristics of Pipe Flow II01:24

General Characteristics of Pipe Flow II

When fluid enters a pipe, it first passes through the entrance region, where the velocity profile adjusts due to viscous effects. In this region, a boundary layer forms along the pipe walls and grows until it fully occupies the pipe's cross-section. Once the boundary layer merges, the flow becomes fully developed, with a steady velocity profile that remains consistent along the pipe's length.
The distance to reach a fully developed flow is called the entrance length and depends on the flow...
Laminar Flow01:27

Laminar Flow

Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
Major Losses in Pipes01:28

Major Losses in Pipes

When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
Single Pipe Systems01:24

Single Pipe Systems

In pipe flow analysis, problems are typically categorized into three types — Type I, Type II, and Type III — based on the known parameters and the desired outcome. Each type of problem addresses specific engineering requirements using fluid properties, pipe characteristics, and operational conditions.
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are known. The...
Minor Losses in Pipes01:25

Minor Losses in Pipes

In pipe systems, minor losses refer to energy losses arising from components such as valves, bends, fittings, expansions, and other features that disrupt the steady flow of fluid. These disturbances cause energy dissipation through turbulence and resistance, which engineers quantify to manage system efficiency effectively.
Valves play a significant role in generating minor losses by obstructing or redirecting the fluid flow. When a valve is closed or partially closed, it restricts the flow...

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Related Experiment Video

Updated: Jun 28, 2026

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
08:25

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

Published on: April 30, 2018

Lifetime statistics in transitional pipe flow.

Tobias M Schneider1, Bruno Eckhardt

  • 1Fachbereich Physik, Philipps-Universität Marburg, Renthof 6, D-35032 Marburg, Germany. tobias.schneider@physik.uni-marburg.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 13, 2008
PubMed
Summary
This summary is machine-generated.

Turbulent motions in pipe flow decay over time. Increasing pipe length linearly increases the decay time, matching experimental findings for turbulent puffs near transitional Reynolds numbers.

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Last Updated: Jun 28, 2026

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Area of Science:

  • Fluid dynamics
  • Turbulence research

Background:

  • Turbulent motions in circular pipe flow near transitional Reynolds numbers are known to decay.
  • Understanding these decaying states is crucial for fluid dynamics research.

Purpose of the Study:

  • To investigate the properties of decaying turbulent states in pipe flow.
  • To determine the effect of pipe length and initial conditions on turbulent decay rates.

Main Methods:

  • Direct numerical simulations were employed.
  • Simulations covered Reynolds numbers up to 2200.
  • Pipes with lengths of 5, 9, and 15 times the diameter were analyzed.

Main Results:

  • The ensemble of initial conditions influences short-term decay but not the long-term decay rate.
  • A linear relationship was observed between pipe length and characteristic decay lifetime.
  • Extrapolation to 30 diameters matched experimental results for equilibrium turbulent puffs.

Conclusions:

  • Decaying turbulent states in pipe flow exhibit predictable behavior.
  • Pipe length is a key factor in the persistence of turbulence.
  • Simulation results align with experimental observations in transitional pipe flow.